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Figure 1
The orange points form a non-crystalline point set. The green balls of radius 2 (21/2) can detect the non-crystallinity of the point set. Smaller balls like the blue one cannot: they all look alike.

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ISSN: 2053-2733
Volume 75| Part 1| January 2019| Pages 1-2
https://doi.org/10.1107/S205327331801642X
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